It's no secret that the Kardashian-Jenner sisters are big fans of showing a little underboob—something Kourtney Kardashian has been embracing full force during her vacation in Mexico this week.
But rather than expose a little underboob in a crop top or cutout dress, the oldest Kardashian sister has instead been trying something a little bit different: hiking up her bikini tops. Kourtney's styling experiment began earlier this week when she wore a red-hot two-piece with the top halfway up her chest—causing many to wonder if the look was intentional.
However, those questions were soon put to rest: Later in the week, Kourtney opted for a navy bikini, again exposing a bit of underboob...
...before debuting a gorgeous rainbow number in a "siesta" snap, where she'd also styled her top the same way.
Of course, this isn't the first time a Kardashian has experimented with an underboob-enhancing bikini, but it seems like Kourtney is here to champion it and turn the look into a new trend. Either that, or she doesn't know how swimsuits work—but I highly doubt that's the case.